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TIL in 1943 to save copper for WWII production, the US Mint made pennies from steel with a coating of zinc. These pennies had a silver appearance rather than the traditional copper coloring.

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7rOwr TIL that the first tiger shark to hatch inside it's mother's uterus eats all the other embryos, and at least one scientist has been bitten by unwisely sticking a finger in a pregnant tiger shark's uterus
oegY TIL When Miles Davis bought a Ferrari, his lawyer called the local police department to tell them its color, so that Davis would not have to deal with the misconception that as a black man, he had stolen the car.
QN8w6 TIL Metallica played a concert in Antarctica to an audience of scientists, thus becoming the first musical act to play on all seven continents.
OoedR TIL that putting Mercury in contact with an Aluminium plate triggers a process called amalgamation. As the Mercury penetrates the Aluminium, strands of Aluminium Oxide start to ‘grow’ out of the plate, forming some pretty wacky structures.
Lv49 TIL after the Freddie Mercury Tribute Concert was announced in 1992, all 72,000 tickets sold out in three hours, even though no performers were announced besides the remaining members of Queen.